Blasting gun for compressed air
CA 2108543 C · Owner: Pedersen, Ejnar · Inventors: Pedersen, Ejnar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The blasting gun for compressed air, in which a dynamic effect of the air is utilized for removing dirt and for cleaning purposes, comprises a built-in oscillator seat valve for producing a pulsating air stream with periodically repeated pressure discharges at a frequency of the order of 2-50 Hz thus causing the valve alternately to open and close an air flow through the blasting gun, this oscillator seat valve comprising a longitudinally displaceable oblong valve body having an end for shutting off the air flow through an air outlet of the gun by resting in contact against a valve seat under the influence of a compression spring, the oblong valve body having another end embodied as a …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 13, 1992 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.